JPH03503785A - Silver-based sintered contact material for contact pieces, especially in low-voltage switches, for use in power switchgear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Silver base for contacts used in power switchgear, especially low voltage switches. sintered contact material The present invention uses at least one high melting point metal, alloy and/or metal compound in addition to silver. Contains as an active ingredient, especially for low voltage switches for use in power switchgear. The present invention relates to silver-based sintered contact materials for contact pieces used in applications. In the case of the present invention, Closing device refers specifically to aerial switchgear.

Connections in low-voltage switchgear for electrical power, e.g. power circuit breakers and DC and auxiliary contactors. For contact pieces, long open silver-metal (AgMe) based contact materials are suitable. has been used. The woody component of this contact material is conventionally silver-nickel (AgNi). It was a system. The excellent properties of silver-nickel in contact systems are well known and For example, the International Journal of Powder Metallurgy Anne 1 Powder Technology-” Volume 12 (1976), It is described on pages 219-228.

However, recently it has been discovered that nickel powder has carcinogenic effects.

Therefore, for several years attempts have been made to replace nickel with other metals or alloys or metal compounds. is being done. However, these new materials have contact characteristics similar to AgNi materials. must have a sexual spectrum.

Therefore, an object of the present invention is to introduce nitrogen as an active ingredient without deteriorating the contact characteristics. First listed form in which Kel is replaced by a metal, alloy or metal compound Our goal is to provide contact materials for

According to the present invention, this problem can be solved by using a contact material with a small amount of active ingredients other than silver (Ag). Both of these can be solved by including iron (Fe) and/or titanium (Ti).

The active ingredient may be present in the material up to 50% by weight.

The presence of iron or titanium, each alone in combination with silver, is within the scope of the invention. It is possible. However, it is preferred that the iron and titanium are present in the form of an alloy. Especially 5 With a composition close to 0 atomic % < ('] 46 weight %), iron and titanium complement each other's properties. forming an intermetallic phase.

In another embodiment of the invention, the contact material additionally contains a metal nitride as another active ingredient. and/or may contain carbide and/or boride. Regarding this, especially in 2. Titanium, but also zirconium or tantalum, can be obtained. metal Nitride and/or carbide and/or boride contain iron-titanium as the main active ingredient. Nitride, carbide and/or the content may be 1 to 50% by weight based on the amount Borides can increase the amount of these base metal components. In other words, it is necessary The amount of silver required can be reduced.

This material may therefore contain up to 50% by weight of base metal components.

Other details and advantages of the invention are apparent from the examples of manufacturing contact pieces described below. There is also a table containing individual examples for various material compositions according to the invention. It's helpful.

The table shows the measured values for maximum welding force (N), volumetric burnout (Peng 3), and contact resistance (m). is listed. These measured values collectively represent the characteristic spectrum of each contact material lamp. In this case, the volumetric burnout is the number of possible openings and closings of the contact, that is, the service life of the contact piece. Contact resistance is an important measure of service life and is a decisive factor against overtemperatures at the contact piece. This is a standard. Each measured value is shown in comparison with the measured values of Ag and Ni1O, respectively.

To manufacture the contact material, first commercially available silver powder and iron or titanium powder, or Fe A powder mixture is manufactured by wet mixing from Ti alloy powder and each powder of other components. . The maximum particle size of the powder is approximately 25 μm. Formed from a powder mixture at a pressure of 200 MPa. Press the profile into a contact piece. Brazing/brazing this contact piece is supported by the method. Regarding the technology to ensure a secure connection with the body, during this pressing process a second layer made of pure silver is used. Advantageously, a two-layer contact strip can be obtained by pressing the layers together with the contact layer. Ru.

Sintering of the shaped profiles takes place at a temperature of approximately 850°C in vacuum or under protective gas for approximately 1 hour. 6) In order to obtain the lowest possible porosity, the sintered body was heated to a pressure of 1000 MPa. After pressing at 1, re-press at 11F650'C in vacuum or under protective gas for about 1 hour. Sinter for a while. Furthermore, the contactor manufactured in this way is calibrated at a pressure of 1000 MPa. .

Selectively for the forming shape method 1. First, the contact material is extruded into strips or wires by extrusion press. A contact piece can also be manufactured by processing it into a shape. Next is this semi-finished product? A contact piece with a precise seam can be separated from the contact piece.

Besides processing using pure Fe powder or Ti powder in a series of experiments, Processed using tan alloy powder. The best properties are that iron and titanium are present in the intermetallic phase FeT It is obtained with FeTi46 alloy forming i. In this case, titanium in particular has a tendency to corrode iron. (, 7), therefore, the long service life of the contact piece is compromised in the absence of titanium. . Therefore, the steel will be damaged.

On each side, the composition of the active ingredient mainly corresponds to the nickel of the material $4AgNilo mountain. approximately 1 part by volume.

In other individual examples, FeTi46-containing Ti4 may contain titanium nitride and/or titanium carbide. Add. The parts by weight should be measured to be 1-50% of the iron-titanium content. Ru. Overall, on each side, the material should be considered to contain up to 50% by weight of base metal components. Should.

A contact piece made of the above material manufactured based on the above recipe can be used to make a test switch. Under certain test conditions, the making current is 1000A and the breaking current is 1000A. Welding force and contact resistance due to volumetric burnout were confirmed after 500 openings and closings.

The results are summarized in a table and compared with the measured values of ordinary AgNi1O material.

The table shows that the highest welding force was the highest welding force for the known AgNi1O comparison material in all examples. It significantly exceeds the contact force, indicating that there is no contact force. On the other hand, volumetric burnout is consistent with comparative materials. The cost is less than that. The contact resistances are in the same order of magnitude, but some are even more Indicates a high value.

However, the contact characteristics obtained by combining the individual values are They show values that can be compared with A g N i ] and O, respectively. Therefore, the above contact material The fee is AgN! # can be replaced with nickel, resulting in complete elimination of carcinogenic nickel can be excluded.

In another example, borides are also used as additional active ingredients in addition to the metal compounds listed above. be able to. In particular, zirconium boride or tantalum boride is expected to have good properties. borides can be combined with carbides and/or nitrides, respectively. Is possible.

table Example Assembling Maximum welding force Volumetric burnout Contact resistance Fs,... (N) ΔVsoo (m’) RKI (mΩ) Comparison material AgNi1O 550450,03I AgFe9 723 12 0.032 AgFe2O40370,053AgFe50 160 2 0.094 Ag (FeTi20) 7.9 297 21 0. O55Ag (FeTi30) 7.5 332 19 0.056 Ag (FeTi46) 6.7 363 21 0.037 Ag (FeTi40)6. 4 456 3 B 0.048 Ag (FeTi30 )7 626 33 0.059 AgTi5.3 B46 23 0.0510 Ag (FeTi2 0) 15 179 1 B 0.081 1 Ag (FeTi46) 5.6 2 5 0 1 7 　　　　　　　　0.0　41N1 12 Ag (FeTi46) 6 382 21 0.0 6TiC0,5 ZrBtO, 25 13Ag (FeTi46) 5.5 351 27 0.04T aC0,5 International Atrocities Report

Claims (12)

[Claims] 1. Contains at least one high-melting point metal, alloy, or metal compound as an active ingredient in addition to silver. For use in power switchgear including In addition to silver (Ag), there are also a few active ingredients in silver-based sintered contact materials. Sintered contact material characterized by containing iron (Fe) and/or titanium (Ti) fee. 2. Sinter according to claim 1, characterized in that the amount of active ingredient is between 2 and 50% by weight. Contact material. 3. Sintered contact according to claim 2, characterized in that the amount of active ingredient is less than 40%. material. 4. Sintered contact according to claim 3, characterized in that the amount of active ingredient is less than 30%. material. 5. Sintered contact according to claim 4, characterized in that the amount of active ingredient is less than 20%. material. 6. Characterized by the presence of iron (Fe) and titanium (Ti) in an alloyed form. The sintered contact material according to claim 1. 7. Iron (Fe) and titanium (Ti) are present at approximately 54-46% by weight, intermetallic compounds 3. Sintered contact material according to claim 2, characterized in that it forms FeTi. 8. Metal nitrides and/or carbides and/or borides are present as other active ingredients Sintered contact material according to one of claims 1 to 7, characterized in that: 9. The amount of nitrides and/or carbides and/or borides is the amount of iron and/or titanium. The sintered contact material according to claim 8, characterized in that the amount is 1 to 50% by weight. 10. Particularly, the metal forming the nitride, carbide and/or boride is titanium. 5. The sintered contact material according to claim 4, wherein the sintered contact material has the following characteristics. 11. The metal forming the nitride, carbide and/or boride is zirconium. The sintered contact material according to claim 4, characterized in that: 12. The metal that forms nitrides, carbides and/or borides is tantalum. The sintered contact material according to claim 4, characterized in that: